A quick and dirty syntax translation / conversion reference guide to ease the transition between Python and Julia. This is not meant as a reference to the language. For that you should [read the manual](http://julia.readthedocs.org/en/latest/manual/).

## Some important differences
  * Arrays in Julia are indexed starting from 1.
  * In Julia classes (i.e. types) don't own methods. Methods are implementations of generic functions and are invoked in a "static style", i.e. instead of Python's str1.rstrip(), we will have rstrip( str1 ), instead of file1.close(), close( file1 ).

## Some important similarities.
  *
  

## Core 

[Getting around: All objects](http://docs.julialang.org/en/release-0.1/stdlib/base/#all-objects)

| *Python*                 | *Julia* | *Comments* |
| -------------------------|---------|----------|
| `True` | `true` | |
| `False` | `false` | | 
| `None` | `nothing` |  |
| `type( obj )` | `typeof( obj )` |  |
| `{}` | `Dict{KeyType,ValueType}()` |  |
| `elif` | `elseif` |  |
| `lambda x, y : y + x * 2` | `(x,y) -> y + x * 2` |  |
| `"string %s interpolation %d" % ( str1, i1)` | `"string $str1 interpolation $i1 "` | You can interpolate arbitrary expressions by enclosing them in braces, as in `"${x+y}"` | 
| `xrange(10,4,-2`)` | `10:-2:4` | |
| `range(10,4,-2)` | `[10:-2:4]` | Do this only if you really have to, as it will consume memory proportional to the length of the range | 
| `id( obj )` | `object_id( obj )` | | 
| `raise excetion` | `throw( exception )` |
## Basic String operations

| *Python*                 | *Julia* |
| -------------------------|-----------|
| `str1 + str2 + str2` |  `string( str1, str2, str3 )`  |
| `len( str1 )` |  `length( str1 )` | 
| `str1.rstrip()` | `rstrip( str1 )` | 
| `str1.startswith( x )` | ??? write your own such as the one in [pytojul.jl](https://gist.github.com/cuckookernel/9777067#file-pytojul-jl) | 


## Regular expressions

| *Python* | *Julia* | 
|----------|---------|
| m = re.match( r"(\d+):(\d+)", mystr ) |  m = match( r"(\d+):(\d+)", mystr )  | 
| <code>m is not None</code> |  m != nothing  |
| arr = m.groups() | arr = m.captures |

## File processing 

| *Python* | *Julia* | 
|----------|---------|
| f = open( "file.txt" ) | f = open( "file.txt") | 
| for line in f  | for line in eachline( f ) | 
| f.close()  | close( f ) | 

## Exceptions 
(http://julia.readthedocs.org/en/latest/manual/control-flow/#exception-handling)

| *Python* | *Julia* | 
|----------|---------|
| `raise excetion` | `throw( exception )` |
| RuntimeError( "msg" ) | (?) ErrorException( "msg" ) |